When poetry-spouting swordsman Tatewaki Kuno invites Ranma & Co. for a jaunt on his new luxury yacht, the last thing the group expects is a sudden storm to shipwreck them all on a deserted island. However, fixing the boat to get home soon becomes the least of their worries, as all the young girls in the group begin to disappear. As it turns out, they've been bride-napped by Prince Toma, the youthful ruler of the floating island, Togenkyo. Because of a magical spring which turns anything it touches instantly male, would-be bridegrooms have to kidnap girls...and in this case, Ranma's reluctant fiancee Akane is one of them!